1 Answer
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created_at[from] date (yyyy-mm-dd hh:mm:ss) return tracks created at this date or later
created_at[to] date (yyyy-mm-dd hh:mm:ss) return tracks created at this date or earlier

does not currently work, as with many of the other queries on SoundCloud.

Aside from it being broken as a query, the created_at timestamp is added when the track is uploaded and is not modifiable. The only way to search by release parameters would be to search first by one of its subresources such as:

GET /users/{id}/tracks list of tracks of the user
GET /users/{id}/playlists list of playlists (sets) of the user
GET /tracks/{id}/comments comments for the track
GET /tracks/{id}/comments/{comment-id} a comment for the track
GET /tracks/{id}/favoriters users who favorited the track
GET /tracks/{id}/favoriters/{user-id} a user who has favorited to the track
GET /tracks/{id}/shared-to/users users who have access to the track
GET /tracks/{id}/shared-to/emails email addresses who are invited to the track

and then to filter the results based on the release property of the track. So for example you could search by /users/{id}/playlists, then filter the results of the tracks on that playlist by the release dates.